Samples taken by the Oregon Department of Environmental Quality now show fecal bacteria levels have decreased at Cannon, Tolovana and Short Sand beaches, the Oregon Health Advisory announced Thursday. The health advisory was issued Wednesday.

Authorities said the bacteria could have come from sources both on shore and inland, including storm water runoff, sewer overflows, and animal waste from livestock, pets and wildlife.

Patrons are still cautioned to stay out of large pools of water and runoff because increased bacteria from fecal matter could have built up in those areas.